Fix talking voice error

api/app/routers/assistants.py

@@ -12,6 +12,18 @@ from ..schemas import (
 
 router = APIRouter(prefix="/assistants", tags=["Assistants"])
 
+OPENAI_COMPATIBLE_DEFAULT_MODEL = "FunAudioLLM/CosyVoice2-0.5B"
+OPENAI_COMPATIBLE_KNOWN_VOICES = {
+    "alex",
+    "anna",
+    "bella",
+    "benjamin",
+    "charles",
+    "claire",
+    "david",
+    "diana",
+}
+
 
 def _is_openai_compatible_vendor(vendor: Optional[str]) -> bool:
     return (vendor or "").strip().lower() in {
@@ -22,6 +34,24 @@ def _is_openai_compatible_vendor(vendor: Optional[str]) -> bool:
     }
 
 
+def _normalize_openai_compatible_voice_key(voice_value: str, model: str) -> str:
+    raw = (voice_value or "").strip()
+    model_name = (model or "").strip() or OPENAI_COMPATIBLE_DEFAULT_MODEL
+    if not raw:
+        return f"{model_name}:anna"
+
+    if ":" in raw:
+        voice_model, voice_id = raw.split(":", 1)
+        voice_model = voice_model.strip() or model_name
+        voice_id = voice_id.strip()
+        if voice_id.lower() in OPENAI_COMPATIBLE_KNOWN_VOICES:
+            voice_id = voice_id.lower()
+        return f"{voice_model}:{voice_id}"
+
+    voice_id = raw.lower() if raw.lower() in OPENAI_COMPATIBLE_KNOWN_VOICES else raw
+    return f"{model_name}:{voice_id}"
+
+
 def _resolve_runtime_metadata(db: Session, assistant: Assistant) -> dict:
     metadata = {
         "systemPrompt": assistant.prompt or "",
@@ -67,12 +97,17 @@ def _resolve_runtime_metadata(db: Session, assistant: Assistant) -> dict:
         voice = db.query(Voice).filter(Voice.id == assistant.voice).first()
         if voice:
             tts_provider = "openai_compatible" if _is_openai_compatible_vendor(voice.vendor) else "edge"
+            model = voice.model
+            runtime_voice = voice.voice_key or voice.id
+            if tts_provider == "openai_compatible":
+                model = model or OPENAI_COMPATIBLE_DEFAULT_MODEL
+                runtime_voice = _normalize_openai_compatible_voice_key(runtime_voice, model)
             metadata["services"]["tts"] = {
                 "enabled": True,
                 "provider": tts_provider,
-                "model": voice.model,
+                "model": model,
                 "apiKey": voice.api_key if tts_provider == "openai_compatible" else None,
-                "voice": voice.voice_key or voice.id,
+                "voice": runtime_voice,
                 "speed": assistant.speed or voice.speed,
             }
         else: